Website performance audit: what slows your site down — and what to check first

A website performance audit answers one question: how fast does your site respond, and how heavy is the page it sends back? Speed matters because a slow site frustrates visitors and gives search engines a weaker page to rank. AuditLixa’s free audit includes performance as one of seven categories — SEO, technical SEO, performance, mobile, content, accessibility, and security basics — with 20 checks in total.

What a website performance audit checks

A performance audit looks at two signals. The first is server response time: how quickly the server starts answering when someone opens the page. If the server is slow, everything else waits behind it. The second is page weight: how much the page sends to the browser. A page carrying very large images or a lot of scripts takes longer to arrive and longer to display.

AuditLixa only reads the public homepage, HTTP headers, robots.txt, and sitemap — the same information any visitor’s browser can see — and most audits finish in a few seconds to under a minute.

What usually slows a website down

Three causes cover most slow sites. Large, uncompressed images are the most common cause on small sites: a photo straight from a camera is far heavier than the size it is shown at. Too many scripts and third-party embeds loading on every page are the second: each one adds waiting time before the page is usable. Slow or overloaded hosting is the third, and it shows up as a slow server response — the one problem no amount of image compression will fix.

What to do with your performance results

Start with the server response if the report flags it, because it affects every visitor and every page, and it is usually a hosting question rather than a design one. Then work through the heaviest items the report lists, usually images first. After fixing something, run the audit again to confirm the change helped — on the free plan you get 2 audits a day, so use the second run to check your fix. If you want help reading the rest of the report, see our guide on how to read your audit report.

A performance audit does not fix your site for you. It tells you where the time goes, so you fix the right thing first. Run your free website audit and see what your own site’s performance checks say.